Mega page with more than 15, 000 words

Hi, if I want to create a mini Spanish course with lets say 10 lessons , could i put them all in the same page ? That would be a mega page with more than 15, 000 words and a table index of contents to each lesson on the top. Or is it better to make one page for each dialogue? But in that those 15 pages wouldn`t rank for any good keyword . I`m a bit confused , maybe it doesn`t matter and both ways are ok? Thanks a lot